The present disclosure relates to a method and an apparatus for automatically controlling a gain in an electronic device based on a sensitivity of microphone. The method according to an embodiment of the present disclosure includes outputting a reference audio to a speaker and obtaining a sound signal output by the speaker through a microphone, comparing a parameter of the obtained sound signal with a stored parameter, and adjusting a gain of the microphone based on a result of the comparing.
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1. A method for controlling a gain in an electronic device, the method comprising: setting an output value of a speaker and a gain value of an external microphone; outputting a reference audio to the speaker; obtaining a sound signal output by the speaker through the external microphone; calculating a root mean square (RMS) value for the obtained sound signal; calculating a difference between a pre-stored RMS value and the calculated RMS value; and adjusting the gain of the microphone based on the difference between the pre-stored PMS value and the calculated RMS value, wherein the pre-stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone.
An electronic device automatically adjusts the gain of an external microphone. The device outputs a reference audio signal from its speaker, which is then picked up by the external microphone. The system calculates the Root Mean Square (RMS) value of the microphone's received audio. This RMS value is compared to pre-stored RMS values that correspond to different distances between the device and the microphone. Based on the difference between the measured and stored RMS values, the gain of the external microphone is adjusted to compensate for distance and optimize audio input levels. The output value of the speaker and a gain value of the external microphone is initially set.
2. The method of claim 1 , wherein adjusting the gain of the microphone is performed at least one of: before recording a sound source with the microphone; before performing a telephone communication; before recording a sound source with the microphone while recording a video; when performing a sound recording, video recording, and telephone communication with the microphone; or if a Root Mean Square (RMS) is lower or higher than a tolerance range predetermined from an RMS set while manufacturing the electronic device.
The gain adjustment process described in the method for controlling a gain in an electronic device by outputting a reference audio to a speaker, obtaining a sound signal output by the speaker through the external microphone, calculating a root mean square (RMS) value for the obtained sound signal, calculating a difference between a pre-stored RMS value and the calculated RMS value, and adjusting the gain of the microphone based on the difference between the pre-stored PMS value and the calculated RMS value, wherein the pre-stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, is performed at one or more of these times: before sound recording; before a phone call; before video recording with sound; during sound/video recording or a phone call; or when the measured RMS is outside a tolerance range established during manufacturing. This ensures optimal microphone levels in various usage scenarios and corrects for manufacturing variances.
3. The method of claim 1 , further comprising: providing an alarm when adjusting the gain of the microphone.
The method for controlling a gain in an electronic device by outputting a reference audio to a speaker, obtaining a sound signal output by the speaker through the external microphone, calculating a root mean square (RMS) value for the obtained sound signal, calculating a difference between a pre-stored RMS value and the calculated RMS value, and adjusting the gain of the microphone based on the difference between the pre-stored PMS value and the calculated RMS value, wherein the pre-stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, includes providing an alert (alarm) to the user when the gain of the microphone is being adjusted.
4. The method of claim 1 , further comprising: calculating an RMS value of a surrounding noise through an internal microphone, if correcting a surrounding noise is necessary; comparing the RMS value of the surrounding noise with an RMS value of noiseless status pre-stored through the internal microphone; and compensating the obtained sound signal from the external microphone according to a result of the comparing.
In addition to controlling a gain in an electronic device by outputting a reference audio to a speaker, obtaining a sound signal output by the speaker through the external microphone, calculating a root mean square (RMS) value for the obtained sound signal, calculating a difference between a pre-stored RMS value and the calculated RMS value, and adjusting the gain of the microphone based on the difference between the pre-stored PMS value and the calculated RMS value, wherein the pre-stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, the device also compensates for surrounding noise. If noise correction is needed, an internal microphone measures the ambient noise level (RMS value). This noise RMS value is compared to a pre-stored RMS value representing a noiseless environment. The audio signal received from the external microphone is then adjusted to remove the effect of the measured ambient noise.
5. An apparatus for controlling a gain in an electronic device, the apparatus comprising: a speaker configured to output a sound; an external microphone configured to obtain a sound signal output by the speaker; an earphone connector configured to connect the external microphone; a memory configured to store a reference audio and at least one root mean square (RMS) value; and a processor configured to: control to set an output value of the speaker and a gain value of the external microphone; control the speaker to output the reference audio; control the external microphone to obtain the sound signal from the speaker calculate an RMS value for the obtained sound signal; calculate a difference between one of the at least one stored RMS value in the memory and the calculated RMS value; and adjust the gain of the external microphone based on the difference between the one of the at least one stored RNMS value in the memory and the calculated RMS value, wherein the one of the at least one stored RWIS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone.
An electronic device automatically adjusts the gain of an external microphone using the following components: a speaker to output sound, an external microphone connector to interface with an external microphone, memory to store a reference audio signal and pre-stored Root Mean Square (RMS) values, and a processor. The processor sets the speaker output level and microphone gain, then outputs the reference audio. The external microphone captures the sound. The processor calculates the RMS value of the captured sound and compares it against stored RMS values that correspond to different distances between the device and the microphone. Based on the difference, the processor adjusts the external microphone's gain.
6. The apparatus of claim 5 , wherein adjustment of the gain of the microphone is performed at least one of: before recording a sound source with the microphone; before performing a telephone communication; before recording a sound source with the microphone while recording a video; when performing a sound recording, video recording, and telephone communication with the microphone; or if a Root Mean Square (RMS) is lower or higher than a tolerance range predetermined from an RMS set while manufacturing the electronic device.
The apparatus for controlling a gain in an electronic device, including a speaker, an external microphone, an earphone connector, a memory and a processor configured to output a reference audio, obtain a sound signal, calculate an RMS value, calculate a difference between stored RMS values and the calculated RMS value, and adjust the gain of the external microphone based on the difference, wherein the stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, performs gain adjustments at one or more of these times: before sound recording; before a phone call; before video recording with sound; during sound/video recording or a phone call; or when the measured RMS is outside a tolerance range established during manufacturing. This ensures optimal microphone levels in various usage scenarios and corrects for manufacturing variances.
7. The apparatus of claim 4 , further comprising: an alarm providing device configured to provide an alarm.
The apparatus for controlling a gain in an electronic device including a speaker, an external microphone, an earphone connector, a memory, and a processor configured to output a reference audio, obtain a sound signal, calculate an RMS value, calculate a difference between stored RMS values and the calculated RMS value, and adjust the gain of the external microphone based on the difference, wherein the stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, further includes an alarm to notify the user about gain adjustments.
8. The apparatus of claim 5 , further comprising: an internal microphone installed in the electronic device; wherein the memory is further configured to store an RMS value of noiseless status, and wherein the processor is configured to control to calculate an RMS of a surrounding noise through the internal microphone if correcting a surrounding noise is necessary, compare the RMS value of the surrounding noise with the stored RMS value of the noiseless status through the internal microphone, and to compensate the obtained sound signal from the external microphone according to a result of comparing.
In addition to the apparatus for controlling a gain in an electronic device including a speaker, an external microphone, an earphone connector, a memory, and a processor configured to output a reference audio, obtain a sound signal, calculate an RMS value, calculate a difference between stored RMS values and the calculated RMS value, and adjust the gain of the external microphone based on the difference, wherein the stored RMS value includes one or more values obtained according to one or more distances between the electronic device and the external microphone, the device also has an internal microphone for noise cancellation. The memory also stores an RMS value representing a noiseless environment measured by the internal microphone. If noise correction is needed, the processor measures the ambient noise level (RMS) using the internal microphone, compares it to the stored noiseless RMS value, and then compensates the audio signal received from the external microphone to remove ambient noise.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
February 23, 2015
November 14, 2017
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